Synthetic resin bottle body with grip

ABSTRACT

This invention is aimed at providing a biaxially drawn, blow-molded PET bottle with a handle, which bottle is highly safe and easy to handle, even in the case of large-size bottles with a capacity as large as a few liters. This can be achieved by improving the insert moldability of the handle and by increasing the strength of fitting of the handle to the bottle. Such a bottle with a handle comprises a polyethylene terephthalate resin bottle and a handle, an injection-molded product made of a synthetic resin, which is fitted firmly to the bottle as an insert. This bottle has a recession that has been caved in at the rear of body and also comprises a vertical projecting wall disposed in the central part of the bottom of this recession. The handle comprises a pair of fitting beams disposed in parallel to each other in the standing position and a grip plate integrally disposed to connect between the pair of fitting beams at both the upper and lower ends thereof. Embedded ridges are disposed broadly in the direction of central axis of the preform at the positions where said embedded ridges stem from the pair of the fitting beams and extend from the base toward the front end face while expanding in width, so that the front end faces are opposed to the periphery of the preform under the condition that the handle is set inside the blow-molding tool. A part of the fitting beams and embedded ridges constitute the handle inserts that are fitted to the recession bottom on both sides of the vertical projecting wall of the bottle.

TECHNICAL FIELD

This invention relates to a synthetic resin bottle with a handle, and inparticular, a large-size synthetic resin bottle with a handle, in whichthe handle is fitted firmly to the bottle by using the handle made of asynthetic resin as an insert and by drawing biaxially and blow-moldingthe bottle of a polyethylene terephthalate resin (hereinafter referredto as the PET resin).

As a large-size bottle, which is easy to handle, there is known asynthetic resin bottle with a handle, in which the handle has beenpreviously injection-molded into a certain shape, and in which the PETbottle is biaxially drawn and blow-molded while using such a handle asan insert. As the handles to be used with this type of synthetic resinbottles with a handle, there are one disclosed in Japanese patent No.2998820 and another one disclosed in the Japanese Patent Application No.2001-328636, which is an improvement from the above patent. A lot ofthese handles are in common use because stable and firm fitting can besecured and because handling of the inserts is easy.

The handle disclosed in the Japanese Patent Application No. 2001-328636is as shown in FIG. 1 and FIGS. 9-12. The handle comprises a grip plate11′ in a vertical strip shape, embedded projecting pieces 15′ disposedon the front end faces at the extended end of this grip plate 11′, apair of engaging ridges 16′ in a vertical ridge shape disposed on thesides facing each other, a pair of fitting beams 12′ in a vertical rodshape, which is provided with the parts serving for the engagement andfitting with the bottle 1′, and a pair of connecting arms 12 a′ in thecurved rod shape, which connect between the pair of fitting beams 12′ atboth the upper and lower ends of the grip plate 11′.

In the case of this handle 10′ shown in these drawings, a verticalprojecting wall 5′ is held tight by the pair of fitting beams 12′ whenthe vertical projecting wall 5′ is formed in the recession 3′ of thebottle 1′. Therefore, the handle 10′ is stably and firmly fitted to thebottle 1′.

The afore-mentioned bottle with a handle can be obtained wheninjection-molded PET preform P′ is blow-molded into the bottle 1′. Atthat time, the handle 10′ previously injection-molded from, for example,polypropylene or PET is fitted to the bottom of the handle-fittingrecession 3′ at the rear of the body 2′ of the bottle 1′ by means ofsimultaneous insert molding.

During the process of afore-mentioned insert molding, the heated andsoftened PET, with which the preform P′ is made of, is smoothly deformedas the PET wall moves along the shapes of the embedded projecting pieces15′ and the engaging ridges 16′, which are the inserts of the handle 10′and are fitted firmly to the bottle 1′. High fitting strength betweenthe handle 10′ and the bottle 1′ is obtained by allowing the PET bottlewall to get around the peripheries of the handle inserts smoothly andtightly.

Smooth deformation such as described above becomes difficult when fairlyhigh stress, which is called the stress hardening, is generated in thePET at the stage in which the preform P′ has been drawn to aconsiderable degree. Therefore, handle insert portions are disposed atpositions as close to the preform as possible so that the insert intothe bottle 1′ can be achieved in the initial stage of drawing.

However, in the field of alcoholic beverages, juices and other softdrinks, there has lately been an increasing need for larger containers.A further strengthened handle structure is pursued so that the bottleshaving a capacity as large as a few liters may not be broken under thestringent drop impact tests.

On the other hand, even if the bottles have a larger capacity thanbefore, the neck does not have a correspondingly large diameter, but hasthe same diameter as that of small-size bottles in many cases because ofthe easiness to discharge the contents. As a result, the handle insertstend to be disposed away from the preform, leaving the PET wall to getaround the inserts insufficiently toward the outer peripheries of theinserts.

This invention has been made to solve the afore-mentioned problem. Thetechnical problems of this invention are to improve the insertmoldability of the handle and to strengthen the fitting of the handle tothe PET bottle to a high level by improving the fitting structure. Theobject of this invention is to provide a biaxially drawn, blow-moldedPET bottle with a handle, which bottle is highly safe and easy tohandle, even in the case of large-size bottles with a capacity as largeas a few liters.

DISCLOSURE OF THE INVENTION

The means of carrying out the invention of Claim 1 to solve theabove-described technical problems exists in the configuration in whicha synthetic resin bottle with a handle comprises a biaxially drawn andblow-molded bottle made of the PET resin, and a handle, aninjection-molded product made of a synthetic resin, which is fittedfirmly to the bottle as the insert, with said bottle having a recessionthat has been caved in at the rear of the body and also comprising avertical projecting wall disposed in the central part of the bottom ofthis recession, and said handle comprising a pair of fitting beamsdisposed in parallel to each other in the standing position and a gripplate integrally disposed to connect between the pair of fitting beamsat both the upper and lower ends thereof,

-   -   wherein embedded ridges are disposed broadly in the direction of        central axis of the preform at the positions where said embedded        ridges stem from the pair of the fitting beams and extend from        the base toward the front end face while expanding in width, so        that the front end faces are opposed to the periphery of the        preform under the condition that the handle is set inside the        blow-molding tool, and    -   wherein a part of the fitting beams and the embedded ridges        constitute the handle inserts that are fitted to the recession        bottom on both sides of the vertical projecting wall of the        bottle.

Under the above-described configuration of Claim 1, embedded ridges aredisposed broadly in the direction of central axis of the preform at thepositions where the embedded ridges stem from the pair of the fittingbeams so that the front end faces are opposed to the periphery of thepreform under the condition that the handle is set inside theblow-molding tool. Even when bottles with a capacity as large as a fewliters are molded, it is possible to make the front end face of theembedded ridge come close to the preform. The preform expanded by airblow at first comes in contact with each front end face, covers it, thenturns both corners, reaches the base of the embedded ridge where theridge is integrated with the fitting beam, and thus gets around theembedded ridge tightly over its outer surface in the initial stage ofdrawing, i.e., in the state with no stress hardening.

Especially if large-size bottles are molded, the blow pressure has to beincreased to a considerably high level, and the embedded ridges receivelarge force. By disposing the embedded ridges broadly in the directionof central axis of the preform, it is possible for this force to bedirected from the front end face to the base in a depressing manner.Since little force is directed laterally, the embedded ridges can beprevented from getting broken.

The embedded ridges have a simple shape in which the ridges extend fromthe base to the front end face while expanding in width. Such a shapeallows the PET bottle wall to move along without being hooked or beingruptured, and smooth PET drawing and deforming can be obtained.Furthermore, because the PET bottle wall can get around the embeddedridges as described above, there can be obtained strong fitting withoutjouncing movement.

The means of carrying out the invention of Claim 2 exists in theconfiguration that embedded ridges are located near a corner set byouter end face and opposed side of each fitting beam, with thecross-section of the embedded ridges having the shape of a roughlyright-angled triangle formed by one side of the right angle extendingroughly perpendicular direction from said opposed side and the otherside of the right angle extending roughly perpendicular direction fromsaid outer end face.

Each embedded ridge in the configuration of Claim 2 comprises anengaging ridge used to fit the conventional handle firmly against theforce acting forward or backward and an embedded projecting piece usedto fit the handle firmly against the force acting in the lateraldirection. Both components are combined into one so that thecross-section of the embedded ridge has the shape of a roughlyright-angled triangle, which the PET wall portion finds it easy to getaround. At the time of blow molding, the hypotenuse of thisright-triangular embedded ridge is allowed to stick out in such a waythat the embedded ridges are disposed near the outer periphery of thepreform to face the wall portion.

The preform is expanded by air blow. The expanded preform at first comesin contact with each hypotenuse namely front end face of the embeddedridgr, covers it, and then turns both corners. At one corner, thepreform deforms along the side of the ridge, which is extending roughlyperpendicular direction from the opposed side of the fitting beam, andreaches this opposed side. At the other corner, the preform deformsalong the other side of the embedded ridge extending roughlyperpendicular direction from the outer end face of the fitting beam, andreaches the outer end face of the fitting beam. Thus, the insertion ofthe handle into the recession of the bottle is completed. Since theembedded ridge has a generally triangular shape in its cross-section,the preform is allowed to get around the embedded ridge tightly alongits outer surfaces.

Because of the above-described shape given to the embedded ridges, thePET wall of the bottle in its blowing process never gets stuck with theembedded ridges and bursts up.

Although the embedded ridges have the shape of roughly right-angledtriangle in their cross-section, this shape widens from the base towardthe edge, and ensures that the PET wall gets around the embedded ridges.Along with this effect, the strength of handle fitting with the bottlecan also be increased.

The means of carrying out the invention of Claim 3 exists in theconfiguration that the embedded ridges specified in the invention ofClaim 2 have a gentle arc along the hypotenuse of the roughlyright-angled triangle in the cross-section.

Under the above-described configuration of Claim 3, the outer surface ofthe preform at first comes in contact with the stick-out front end faceof each embedded ridge in the initial stage of air blow process. Thus,it becomes easy for the PET bottle wall to move along the front end faceand to get around the both side of the embedded ridge smoothly andsecurely.

The means of carrying out the invention of Claim 4 exists in theconfiguration that the embedded ridge specified in Claim 1, 2, or 3 hastwo peaks in the forward, peak height direction.

Under the configuration of Claim 4, the PET bottle wall gets around theembedded ridge across the low area between the two peaks. This ensuresfirm fitting also in the vertical direction.

The means of carrying out the invention of Claim 5 exists in theconfiguration that the embedded ridges specified in Claim 1, 2, 3, or 4have smooth rounded surfaces.

Under the above-described configuration of Claim 5, the smooth roundedsurfaces of the embedded ridges make it possible for the PET preform tobe drawn and deformed smoothly without getting hooked by the corners ofthe embedded ridges and to be blow-molded successfully into the bottle.

The means of carrying out the invention of Claim 6 exists in theconfiguration that the handle specified in Claim 1, 2, 3, 4, or 5 ismade of PET.

The above configuration of Claim 6 facilitates separate collection ofbottles at the time of waste disposal.

The means of carrying out the invention of Claim 7 exists in theconfiguration that the embedded ridges specified in Claim 6 are providedwith many lateral, narrow grooves on the peripheral surfaces.

As compared with the polypropylene handle, the PET handle has lowerslidability upon contact with the PET bottle wall. Due to theabove-described configuration of Claim 7, slidability is improvedbetween the PET bottle wall and the handle inserts. As a result, thebottle can be blow-molded more smoothly, and the PET bottle wall isallowed to get around the embedded ridges without fail.

The means of carrying out the invention of Claim 8 exists in theconfiguration that almost entire surfaces of the inserts of the handlespecified in Claim 6 or 7 have been roughened in advance for theconvenience of smooth contact with the bottle during the blow moldingoperation.

Under the above-described configuration of Claim 8, slidability isimproved between the PET bottle wall and the handle inserts. As aresult, the bottle can be blow-molded more smoothly, and the PET bottlewall is allowed to get around the embedded ridges sufficiently.

The means of carrying out the invention of Claim 9 exists in theconfiguration that the handle specified in Claim 6, 7, or 8 comprises apair of fitting beams disposed in parallel to each other in the standingposition, connecting arms that are bent and connected to the upper andlower ends of the fitting beams, a grip plate integrally disposed toconnect between the pair of fitting beams through the intermediary ofthe connecting arms, wherein the connecting arms, a part of the fittingbeams, and embedded ridges constitute the handle inserts that are fittedto the recession bottom on both sides of the vertical projecting wall ofthe bottle under the condition that the connecting arms have portionscovered with smooth surfaces that come in contact with the bottle.

The grip plate is integrally disposed to connect between the pair offitting beams through the intermediary of the bent connecting arms atboth the upper and lower ends. In this configuration, the handle can beinserted smoothly into the recession bottom on both sides of thevertical projecting wall of the bottle, and there can be obtained abottle with a handle having fine appearances.

Therefore, when the PET preform is drawn, strong force pushes a portionof the expanding bottle wall against the surfaces of the inserts of thePET handle, i.e., the surfaces of the connecting arms, the fittingbeams, and the embedded ridges. At that time, the PET bottle getsabrasions on the clear bottle wall, especially at places near theconnecting arms. The problem of resultant bad appearance of the bottlehas to be solved.

The connecting arms are disposed behind the main portions of the handleinserts, including the front end faces of the embedded ridges or theouter end faces of the fitting beams, and are bent backward andconnected to the grip plate. Because of such a shape, the closer to theconnecting portions of the grip plate, the more distant positions, awayfrom the outer wall surface of the preform, is taken by the outer endfaces of the connecting arms under the condition that the handle hasbeen set inside a split mold. The preform comes in contact with outersurfaces of the connecting arms in a much later time at a relativelyadvanced stage of drawing (expanding) deformation, i.e., under thecondition that hardening due to drawing or what is called the “strainhardening” has already been in progress.

At the initial stage of drawing, the preform comes in contact with thefront end faces of the embedded ridges, turns the corners thereof, andthus has relatively small opportunities in which the PET surface suffersabrasions. However, after the connecting arms have come in contact withthe preform, the PET wall portion does not get around these arms, but ispressed against the front end faces of these arms by the large forcecaused by air blow. Since at that time, the PET wall portion is drawnand expands while sliding along the front end faces in a rasping way,abrasions are expected to occur.

The configuration according to Claim 9 has been devised, while givingconsideration to the state in which the PET preform is drawn andhardened at the stage of contact with the connecting arms, and also tothe mechanism of abrasions. These abrasions can be prevented fromoccurring, by smoothing beforehand the surfaces of the connecting armsthat come in contact with the expanding preform. Thus, the slidabilityof the expanding preform is improved when it slides over the smoothsurfaces of the connecting arms.

The PET preform, when used in the softened state as is the case in thisinvention, undergoes a large change in viscoelasticity, depending on thetemperature and the drawing record. Yet it is presumed that the improvedslidability caused by the smoothed contact areas is effective after thePET drawing has been in much progress and the PET is right in theprocess of large strain hardening.

The means of carrying out the invention of Claim 10 exists in theconfiguration that the connecting arms specified in the invention ofClaim 9 have smooth surfaces only in the specific areas.

Under the above-described configuration of Claim 10, smooth surfaces ofthe connecting arms are achieved by smoothing (mirror-finishing) thosecorresponding portions of the injection molding mold. The development ofabrasions is delicately affected by such factors as the angle of contactbetween the expanding preform and the surfaces of the connecting arms,which are disposed at a total of 4 places, i.e., upper and lower ends ofthe right and left sides of the grip plate. In a case, abrasions occuronly on the upper connecting arms. Therefore, it is not always necessaryto smooth all the surfaces of the four connecting arms, which come incontact with the bottle. The occurrence of abrasions can be controlledby smoothing partially those specific portions that are selectedsuitably while checking over the places of abrasions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of the entire synthetic resin bottle with a handlein an embodiment of this invention.

FIG. 2 is a cross-sectional plan view of the bottle with a handle, takenfrom line A-A in FIG. 1.

FIG. 3 is a rear view of the handle used in the embodiment shown in FIG.1.

FIG. 4 is a front elevational view of the handle used in the embodimentshown in FIG. 1.

FIG. 5 is a cross-sectional view of the handle used in the embodimentshown in FIG. 1, taken from line B-B in FIG. 2.

FIGS. 6(a) and 6(b) are cross-sectional plan views of important parts,taken from lines C-C and D-D in FIG. 5.

FIG. 7 is an explanatory diagram shown in a cross-sectional plan view,taken from line F-F in FIG. 4.

FIGS. 8(a) and 8(b) are referential photographs showing magnifiedsurfaces of the connecting arms of the handle before (b) and after (a)the smoothing treatment.

FIG. 9 is a cross-sectional plan view of the synthetic resin bottle witha handle in the conventional art, taken from A-A in FIG. 1.

FIG. 10 is a rear view of the handle used in the conventional art shownin FIG. 9.

FIG. 11 is a front elevational view of the handle used in theconventional art shown in FIG. 9

FIG. 12 is a cross-sectional view of the handle shown in FIG. 9, takenfrom line E-E in FIG. 8.

A PREFERRED EMBODIMENT OF THE INVENTION

This invention is further described with respect to a preferredembodiment, now referring to the drawings (FIGS. 1-8).

The bottle of this invention comprises the bottle 1 and the handle 10.The bottle 1 is a biaxially drawn, blow-molded PET product of a largesize (1.0 liter or more), and is provided with a recession 3 that hasbeen caved in at the rear of the upper half of the bottomed cylindricalbody 2. The handle 10 is an injection-molded PET product, which isfitted firmly to the recession 3 by an insert molding means.

The recession 3 of the bottle 1 comprises a vertical projecting wall 5disposed in the center of recession bottom 4, where the flat projectingwall 5 stands upright, except for the upper and lower ends of therecession 3. This projecting wall 5 is relatively wide and extendsvertically over the total height of the recession 3, with the wallheight being roughly constant from side to side (See FIG. 2).

A pair of fitting beams 12 in a straight bar shape is disposed inparallel to each other and is connected to the vertical grip plate 11through the intermediary of the connecting arms 12 a that are curved atboth the upper and lower ends. The embedded ridges 17 are located nearthe corner set by the outer end face 13 and the opposed side 14 a ofeach fitting beam 12. The cross-section of each embedded ridge has agenerally right-angled triangular shape formed by one side of the rightangle extending roughly perpendicular direction from the opposed side 14a and the other side of the right angle extending roughly perpendiculardirection from the outer end face 13 (See FIG. 6(a)).

Under the above-described configuration, the embedded ridges 17 aredisposed broadly in the direction of central axis of the preform at thepositions where the embedded ridges 17 stem from the pair of the fittingbeams 12 and extend from the base toward the front end face 19 whileexpanding in width, so that the front end faces 19 are opposed to theperiphery of the preform under the condition that the handle is setinside the blow-molding tool (See FIG. 2).

The front end face 19 of the embedded ridge 17 corresponds to thehypotenuse of a right-angled triangle in its cross-section, and forms agentle arc. Almost entire surfaces of the handle inserts are roughenedin advance. And many lateral, narrow grooves 25 are notched in the outerperipheral surface of each embedded ridge 17. All these devices improvethe slidability of the PET wall of the bottle 1 when it is in thesoftened state during the blow molding.

The embedded ridge 17 in this embodiment is a two-peak ridge with a lowarea 18 in between. In this low area 18, the engaging ridge 16 isdisposed as an insert, which has a shape obtained by cutting out aportion perpendicular to the outer end face 13 of the fitting beam 12from the cross-section of the embedded ridge 17 (See FIG. 6(b)). Thetwo-peak form of the embedded ridge 17 is intended to reduce the handleweight and to improve the fitting strength further by allowing the wallof the PET bottle to get around this low area 18. In designing anembedded ridge 17, one skilled in the art can decide on whether thetwo-peak form is adequate or not, giving consideration to themoldability, because a ridge without the low area 18 has also fullfitting strength. In addition, the embedded ridge 17 may have three ormore peaks, depending on the purpose.

The surfaces of the curved connecting arms 12 a, or at least thosesurfaces thereof that come in contact with the bottle 1, have beensmoothed in advance. This improves the slidability of the drawn andexpanding PET preform P during the biaxial drawing and blow moldingoperation using the handle 10 as the insert, and also prevents thebottle 1 from getting damages caused by friction.

In the preferred embodiment of this invention, the pair of upperconnecting arms 12 a has been smoothed over the range indicated by 12Cin FIG. 7. Depending on the abrasion development situation, the area tobe smoothed can be selected. For example, the pair of lower connectingarms 12 a can be smoothed, if necessary.

The handle 10 is fitted to the bottle 1 by using the handle 10 as theinsert and by drawing biaxially and blow-molding the bottle 1. At thetime of blow molding, the embedded ridge 17 is disposed at a positionopposite the neighborhood of outer wall of the bottle in such a mannerthat the front end face 19 of the embedded ridge 17 is stuck out underthe condition that the handle has been set inside the blow-molding tool(See FIG. 2).

The PET preform P is expanded into the bottle 1 by air blow. Theexpanded PET wall of the preform P comes in contact with the front endface 19 of the embedded ridges 17, covers it, and then turns bothcorners 21 a and 21 b. At one corner 21 a, the preform deforms along therear side of the embedded ridge 20 a and reaches the opposed side 14 a.At the other corner 21 b, the preform deforms along the side of theembedded ridge 20 b and the outer end face 13 of the fitting beam 12.Finally the preform reaches the edge of the outer side 14 b of thefitting beam 12, and thus, the insertion of the handle 10 into therecession of the bottle 1 is completed. Since the embedded ridge 17 hasa generally right-angled triangular shape in its cross-section, the PETpreform is allowed to get around the embedded ridge 17 tightly along itsouter surfaces (See FIG. 6(a)).

The above-described blow molding with the handle 10 used as the insertensures that the embedded ridges 17 and a part of fitting beams 12 areinserted and embedded in the recession bottom 4 on both sides of thevertical projecting wall 5 of the bottle 1. Thus, the handle 10 isfirmly fitted to the bottle 1 (See FIG. 2).

Bottles with a capacity of 4 liters were blow-molded, and the handlestrength was measured by a handle-pulling method, to determine thestrength of the inserts of handle 10. The bottle in the embodiment ofthis invention gave a value of 61 Kgf, which was twice or more in itsstrength, as compared to 25 Kgf in the conventional example shown inFIG. 1 (common to both of the conventional example and this invention)and FIGS. 9-12.

In the meantime, FIG. 7 is an explanatory diagram showing estimateddeformation of the preform P at a height of the well upper portion ofeach connecting arms 12 a near the connection to the grip plate 11 (theheight of line F-F in FIG. 4). The preform P presumably comes in contactwith the end face 12 b of the connecting arms 12 in the state in whichthe preform P has been drawn and expanded considerably more than whenthe preform P has come in contact with the front end faces 19 of theembedded ridges 17 or with the outer end faces 13 of the fitting beams12. Then, the preform P is further drawn and deformed, while slidingalong the end face 12 b of the connecting arms 12 a without gettingaround the connecting arms 12 a so largely as to reach the rear side.The arrows Df in FIG. 7 indicate the estimated directions in which thepreform P is expanded and deformed.

Bottles with a 4-liter capacity in the shape shown in the embodimentwere blow-molded to determine the smoothing effect of especially theconnecting arms used in the bottle of this invention. For thenon-smoothed surfaces of the connecting arms 12 a, abrasions were foundat a high frequency, especially at positions near the upper connectingarms (Abrasive wall portion 26 in FIG. 7). These abrasions could havebeen prevented from occurring by smoothing beforehand those areas whereexpanding preform P comes in contact with the upper connecting arms 12 a(Smoothed area 12 c in FIG. 7).

FIGS. 8(a) and 8(b) are referential photographs showing surface statesof the connecting arms 12 a before and after the above-describedsmoothing treatment.

INDUSTRIAL APPLICABILITY

This invention comprising the above-described configuration has thefollowing effects:

In the configuration of Claim 1, even when bottles as large as a fewliters are molded, it is possible to make the front end face of theembedded ridge come close to the preform. The preform expanded by airblow at first comes in contact with each front end face, covers it, thenturns both corners, reaches the base of the embedded ridge that isintegrated with each fitting beam, and thus gets around the embeddedridge tightly along its outer surface at the initial stage of drawing,i.e., in the state with no stress hardening.

The embedded ridges have a simple shape in which each ridge extends fromthe base to the front end face while expanding in width. Such a shapeallows the PET bottle wall to move along without being hooked or beingruptured, and smooth PET drawing and deforming can be obtained.Furthermore, because the PET bottle wall can get around the embeddedridges as described above, there can be obtained strong fitting of thehandle to the bottle.

In the invention of Claim 2, the embedded ridges are given the shape ofa roughly right-angled triangle in their cross-section. This enables thePET bottle wall to get around the embedded ridges easily in the blowmolding operation and allows the handle and the bottle to be fittedfirmly to each other.

Although the embedded ridges have the shape of a roughly right-angledtriangle in their cross-section, this shape widens from the base towardthe edge, and ensures that the PET wall gets around the embedded ridgesstably. Along with this effect, the strength of handle fitting to thebottle can also be increased.

In the invention of Claim 3, the embedded ridges have a gentle arc alongtheir front end faces. The outer surface of the preform at first comesin contact with the stick-out front end face of each embedded ridge atthe initial stage of air blow process. Thus, it becomes easy for the PETbottle wall to move along the front end face and to get around theembedded ridge to reach the both side thereof smoothly and securely.

In the invention of Claim 4, two-peak embedded ridges are formed in theforward, peak height direction. The PET bottle wall gets around theembedded ridge across the low area between two peaks. This ensures firmfitting also in the vertical direction.

In the invention of Claim 5, the smooth rounded surfaces of the embeddedridges make it possible for the PET bottle wall to be drawn and deformedsmoothly without getting hooked by the corners of the embedded ridgesand to be blow-molded successfully into the bottle.

In the invention of Claim 6, the handle is made of PET so as tofacilitate separate collection of bottles at the time of waste disposal.

In the invention of Claim 7, many lateral, narrow grooves are notched inthe outer surfaces of the embedded ridges. Due to this configuration,slidability can be secured even between the PET handle inserts and thePET bottle wall. The bottle can be blow-molded more smoothly than ever,and the PET bottle wall is allowed to get around the embedded ridgessuccessfully.

In the invention of Claim 8, almost entire surfaces of the handleinserts have been roughened in advance. This also serves to secure theslidability between the PET bottle wall and the PET handle inserts. As aresult, the bottle can be blow-molded more smoothly than ever, and thePET bottle wall is allowed to get around the embedded ridgessufficiently.

In the invention of Claim 9, abrasions can be prevented from occurring,by smoothing the surfaces of the connecting arms that come in contactwith the bottle so that the slidability is improved between theconnecting-arm surfaces and the softened PET preform P, which is rightin the process of drawing and expansion.

In the invention of Claim 10, it is not always necessary to smooth allthe surfaces of the connecting arms, which come in contact with thebottle. The occurrence of abrasions can be controlled by smoothingpartially those specific portions that are selected suitably whilechecking over the places of abrasions.

1. A synthetic resin bottle with a handle, which comprises a biaxiallydrawn and blow-molded bottle made of a polyethylene terephthalate resinand a handle, which is an injection-molded product made of a syntheticresin and is fitted firmly to the bottle as an insert, with said bottlehaving a recession that has been caved in at the rear of body and alsocomprising a vertical projecting wall disposed in the central part ofthe bottom of said recession, and said handle comprising a pair offitting beams disposed in parallel to each other in the standingposition and a grip plate integrally disposed to connect between thepair of said fitting beams at both the upper and lower ends thereof,wherein embedded ridges are disposed broadly in the direction of centralaxis of the preform at the positions where said embedded ridges stemfrom the pair of the fitting beams and extend from the base toward thefront end face while expanding in width, so that the front end faces areopposed to the periphery of the preform under the condition that thehandle is set inside the blow-molding tool, and wherein a part of saidfitting beams and embedded ridges constitute the handle inserts that arefitted to the recession bottom on both sides of the vertical projectingwall of the bottle.
 2. The synthetic resin bottle with a handle,according to claim 1, wherein said embedded ridges are located near acorner set by outer end face and opposed side of each fitting beam, withthe cross-section of said embedded ridge having the shape of a roughlyright-angled triangle formed by one side of the right angle extendingroughly perpendicular direction from said opposed side and the otherside of the right angle extending roughly perpendicular direction fromsaid outer end face.
 3. The synthetic resin bottle with a handleaccording to claim 2 wherein the cross-section of said embedded ridgesis in the shape of a roughly right-angled triangle, with the hypotenusethereof forming a gentle arc.
 4. The synthetic resin bottle with ahandle according to claim 1, wherein said embedded ridges have atwo-peak configuration.
 5. The synthetic resin bottle with a handleaccording to claim 1, wherein the embedded ridges have smooth roundedsurfaces.
 6. The synthetic resin bottle with a handle, according toclaim 1, wherein the handle is made of a polyethylene terephthalateresin.
 7. The synthetic resin bottle with a handle according to claim 6wherein many lateral, narrow grooves are notched in the outer surfacesof said embedded ridges.
 8. The synthetic resin bottle with a handleaccording to claim 6, wherein almost entire surfaces of the inserts ofthe handle have been roughened where the handle comes in contact withthe bottle.
 9. The synthetic resin bottle with a handle according toclaim 6, wherein said handle comprises a pair of fitting beams disposedin parallel to each other in the standing position, connecting arms thatare bent and connected to the upper and lower ends of said fittingbeams, and a grip plate integrally disposed to connect between the pairof said fitting beams through the intermediary of said connecting arms,and wherein said connecting arms, a part of said fitting beams, andembedded ridges constitute the handle inserts that are fitted to therecession bottom on both sides of the vertical projecting wall of thebottle under the condition that said connecting arms have portionscovered with smooth surfaces that come in contact with the bottle. 10.The synthetic resin bottle with a handle, according to claim 9, whereinsmooth surfaces of the connecting arms are limited to a portion thereof.